Introducing the Edwards Signaling SD-T18 SD Series SuperDuct 18" Air Sample Tube, expertly designed for duct smoke detectors. With a slim profile of less than 2" deep, it fits seamlessly into tight spaces, making installation a breeze. This innovative tube features a PCB-mounted photoelectric sensor equipped with advanced intelligence for optimal performance. Its patented differential sensing technology ensures reliable environmental compensation, providing stable and drift-free sensitivity. Capable of handling high air velocities up to 4000 ft/min, it is compatible with standard Kidde Intelligent smoke detectors. Upgrade your safety system today with the SD-T18 and experience peace of mind!